Interfacially Assembled Anion Exchange Membranes for Water Electrolysis.

Area of Science:

• Materials Science
• Electrochemistry
• Chemical Engineering

Background:

• High-performance anion exchange membranes (AEMs) are crucial for cost-effective green hydrogen production via water electrolysis.
• Current AEMs often involve complex fabrication and suffer from suboptimal performance and durability.

Purpose of the Study:

• To develop a novel, high-performance, and durable AEM using a simplified fabrication method.
• To enhance electrochemical performance and longevity for alkaline water electrolysis (AWE) and AEM water electrolysis (AEMWE).

Main Methods:

• Fabrication of a highly cross-linked polymer AEM via a one-pot, in situ interfacial Menshutkin reaction.
• Incorporation of high-density quaternary ammoniums and nanovoids within a porous support structure.
• Evaluation of electrochemical performance and durability under AWE and AEMWE conditions.

Main Results:

• The novel AEM exhibits high anion conductivity, controlled water uptake, and excellent mechanical/thermochemical stability.
• Achieved outstanding AWE performance (0.97 A cm⁻² at 1.8 V) and AEMWE performance (5.23 A cm⁻² at 1.8 V) in 5 wt% KOH at 80 °C.
• Demonstrated superior performance and long-term durability compared to existing commercial and developed membranes.

Conclusions:

• The one-pot interfacial Menshutkin reaction offers an effective strategy for fabricating advanced AEMs.
• The developed AEM shows significant potential for improving the efficiency and economics of green hydrogen production.
• This approach is applicable to various energy and environmental applications requiring robust membranes.